Question

我正在使用基于类的视图，例如

class PostListByMostViewedView(ListView):
    model = Post
    template_name = 'community/mostviewed_home.html'  # <app>/<model>_<viewtype>.html
    context_object_name = 'posts'
    ordering = ['-views']
    paginate_by = 5

Models.py

   class Post(models.Model):
        views = models.PositiveIntegerField(default=0)

然后按视图列出帖子。但我有不同的型号

class Comment(models.Model):
    post = models.ForeignKey(Post, on_delete=models.CASCADE)

我想按帖子数订购。我以为这可以工作

ordering = ['-post.comment_set.count']

但这失败了没有这样的列：post.comment_set.count

Answer 1

您可以.annotate(..) [Django-doc]个<?php $z = file('q1.txt'); echo $z[1]; echo (mt_rand(1,9)); $st = array($z[1]); foreach($st as $ls) {echo " <li>$ls</li>\n";}对象和Post中的项目数，然后.order_by(..) [Django-doc]该注释：

comment_set

令人高兴的是，查询集中的每个from django.db.models import Count class PostListByMostViewedView(ListView): model = Post queryset = Post.objects.annotate( ncomments=Count('comment') ).order_by('-ncomments') template_name = 'community/mostviewed_home.html' context_object_name = 'posts' paginate_by = 5对象现在都有一个额外的属性Post，其中包含注释的数量。

如何在基于类的视图中进行订购

1 个答案: